I dig the game, but trying to play the full version at this point will probably be too frustrating. When it's been out for a while and there are more complete guides available, then maybe.
(Some of the things the walkthrough said needed doing would have been fairly unlikely for me to come up with myself, I think. So, clearly, I need to wait for better walkthroughs.)
If you ended up here because you have the demo and are trying to find the walkthrough, go to your start menu entry for Aquaria and pick the "Readme". Scroll down to where it says "Stuck in the first part of the game?" and there's a walkthrough link there. It came with the demo.